Analytical modeling of operating characteristics of premixingprevaporizing fuelair mixing passages. Volume 1: Analysis and results
Abstract
A model for predicting the distribution of liquid fuel droplets and fuel vapor in premixingprevaporizing fuelair mixing passages of the direct injection type is reported. This model consists of three computer programs; a calculation of the two dimensional or axisymmetric air flow field neglecting the effects of fuel; a calculation of the three dimensional fuel droplet trajectories and evaporation rates in a known, moving air flow; a calculation of fuel vapor diffusing into a moving three dimensional air flow with source terms dependent on the droplet evaporation rates. The fuel droplets are treated as individual particle classes each satisfying Newton's law, a heat transfer, and a mass transfer equation. This fuel droplet model treats multicomponent fuels and incorporates the physics required for the treatment of elastic droplet collisions, droplet shattering, droplet coalescence and droplet wall interactions. The vapor diffusion calculation treats three dimensional, gas phase, turbulent diffusion processes. The analysis includes a model for the autoignition of the fuel air mixture based upon the rate of formation of an important intermediate chemical species during the preignition period.
 Publication:

Final Report United Technologies Research Center
 Pub Date:
 1982
 Bibcode:
 1982utrc.rept.....A
 Keywords:

 Drops (Liquids);
 Fuel Injection;
 Liquid Fuels;
 Premixing;
 Vapor Phases;
 Air Flow;
 Heat Transfer;
 Mass Transfer;
 Mathematical Models;
 Two Dimensional Flow;
 Fluid Mechanics and Heat Transfer